Since Chicago’s Orchestra Hall was retooled in 1997 there have been compaints, lots of them about the sound. Now the orchestra has hired another acoustics expert to see about fixing the sound. Chicago Tribune critics weigh in with their concerns. “In the discussions here, which also include CSO officials, sound consultants and performers, we tried to find out why the sound at Orchestra Hall has gotten worse since the 1997 renovation. Exactly how bad and why was at the core of our conversations.”